Assenmacher Specialty Tools, Inc. part No. OFTOY1038. Just tested it and it fit perfectly, very tight seal with the gasket. High quality plastic (ABS I think) and MADE IN THE USA! No more oil drips or spills!

I have an old funnel I bought probably 20 years ago, it has that long neck that unscrews and I was completely happy when I discovered that it screwed into the filler neck, just tip the bottles upside down and no more drips or standing there holding the funnel and realizing you set the beer down just out of reach

Assenmacher Specialty Tools, Inc. part No. OFTOY1038. Just tested it and it fit perfectly, very tight seal with the gasket. High quality plastic (ABS I think) and MADE IN THE USA! No more oil drips or spills!